Sharpening devices for blades of slicing and cutting machines



May 31, 1955 x. B. K. GREEN ET AL 2,709,325

SHARPENING DEVICES FOR BLADES OF SLICING AND CUTTING MACHINES Filed June 18, 1953 United States Patent f SHARPENING DEVICES FOR BLADES OF SLICING AND CUTTING MACHINES Xan B. K. Green, New Paltz, and Harry Preble, Jr., Cross River, N. Y., assignors to General Slicing Machine Co., Inc., Walden, N. Y., a corporation of New York Application June 18, 1953, Serial No. 362,565

6xClaims. (Cl. 51-248) use in food slicing machines and such embodiment is illustrated herein to show one application of this invention.

An object of this invention is to provide a novel and improved manually-manipulated sharpening device of the character mentioned, in which the pressure of the sharpener wheel against the blade is automatically controlled and is independent of the force the operator applies to bring said wheel into sharpening position.

Another object hereof is to provide a sharpening device of the nature set forth, of novel and improved construction in which the force applied by the operator to shift the sharpener wheel into sharpening position, is not imparted to such wheel to bear pressure against the blade, thus avoiding burning of the cutting edge.

Another object hereof is to provide a novel and improved sharpening device for disc cutting blades, applicable for use in food slicing machines.

A further object of this invention is to provide a disc blade sharpening device of novel and improved construction, which is reasonably cheap to manufacture, easy to use and efiicient in carrying out the purposes for which it is designed.

Other objects and advantages will become apparent as this disclosure proceeds.

In the accompanying drawings forming part of this specification, similar characters of reference indicate corresponding parts in all the views.

Fig. 1 is a perspective view of a food slicing machine which includes a sharpening device embodying the teachings of this invention.

Fig. 2 is a section taken at line 2-2 in Fig. 1, showing the sharpening device in its normal rest inactive position.

Fig. 3 is like Fig. 2, but shows the sharpening device in operative position.

In the drawings, the numeral 15 designates generally a food slicing machine having a rotatably mounted disc cutting blade 16 on the housing 17 which is provided with a boss 18 having a bore 19 therethrough. A hearing element 20, fixedly secured in any suitable manner within this bore, supports a slidable shank 21 therein. This shank extends from both ends of said boss and carries an abrasive sharpening wheel 22 which is rotatably and slidably mounted on the end of the shank which is within the housing 17, while the outer end of the shank carries a push-button element 23 which is slidably fitted within the bore 19. The faces of the push-button 23 and the bearing element 20 which are opposite each other, are cupped or otherwise suitably recessed to receive the ends of a compression coil spring 24 therein respectively; said coil spring being on and about the shank 21, and of course within said bore 19.

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2,709,325 Patented May 31., 1953's sharpening wheel v22.

:It is 'to be noted that the blade-contacting surface of the sharpening-wheel, shall give the required slant to the cutting rim surface 16' of theblade 16. In the embodiment illustrated, the blade-contacting surface of the wheel, is indicated by the numeral 22. Also, the extent of movement permitted the button 23 into the hub 18, should equal that necessary to bring the bladecontacting surface of the sharpening wheel in contact with said blade 16, plus such distance as may be required to create a stress in the compression coil spring 25 suitable to effect proper pressure of the sharpening wheel against the blade, to accomplish the required sharpening operation without burning or otherwise hurting the said blade. The additional shift of the shank 21 after the blade is contacted by the sharpener wheel, creates the gap indicated at A. It is evident that the only force creating the pressure of the sharpener wheel 22 against the blade 16, is that supplied by the stressed coil spring 25 and is independent of the pressure applied on the push-button 23. It is evident that the bearing element 20 need be so positioned so as to act as the stop for push-button movement at the proper place. The coil spring 25 should have some stress in it, so that when the sharpener wheel 22 is away from the blade 16, said wheel shall be up against the stop or head 21. Sharpening of the blade occurs upon its rotation While the sharpening device is in the condition shown in Figure 3.

This invention is capable of numerous forms and various applications Without departing from the essential features herein disclosed. It is therefore intended and desired that the embodiment shown herein be deemed illustrative and not restrictive and that the patent shall cover all patentable novelty herein set forth; reference being had to the following claims rather than to the specific description herein to indicate the scope of this invention.

We claim:

1. In combination with a frame and a bevel-edged disc blade rotatably mounted thereon, of a blade sharpening means comprising a shank longitudinally slidably mounted on a frame part which is spaced from said blade; the ends of said shank extending into space, a blade sharpening-member slidably carried on one end of the shank; said shank being positioned whereby on longitudinal movement thereof in one direction, said sharpening member will contact the bevelled edge of the blade; said shank having a protuberance on said end to maintain said sharpening member and shank in associated relation, a first spring means carried on and riding along with said shank upon movement of said shank; said first spring means acting on said sharpening member to urge same towards the bevelled edge of the blade, a second spring means acting on the said shank to urge same to move so that said protuberance shall carry said sharpening member away from said blade edge; said first spring means becoming stressed and exerting sufiicient force on the sharpening member when the latter and the blade are in contact to elfect sharpening of said blade when the said shank is moved further in said di rection and said blade revolved; said shank being capable of movement in the mentioned direction to such extent that said protuberance will not stop movement of the sharpening member along the shank when said member and the blade are in contact; the second spring means in normal rest condition, holding the shank in such po' sition that the protuberance on said shank holds the sharpening member out of contact with the blade.

2. The combination as defined in claim 1, wherein the blade sharpener member is a wheel rotatably carried on the shank.

3. The combination as defined in claim 1, wherein the blade sharpener member is a wheel rotatably mounted on the shank in coaxial relation therewith.

4. The combination as defined in claim 1, wherein the shank is positioned angularly to the axis of the disc blade and wherein the sharpener member is a wheel rotatably mounted on the shank in co-axial relation therewith; a radial face of the Wheel being the surface which 4 contacts the bevelled edge of the disc blade when the shank is moved in the mentioned direction.

5. The combination as defined in claim 1, wherein each spring means consists of a coil spring positioned about the shank.

6. The combination as defined in claim 1, wherein each spring means consists of a compression coil spring positioned about the shank.

References Cited in the file of this patent UNITED STATES PATENTS 889,830 Van Berkel June 2, 1908 986,617 Wolff et a1 Mar. 14, 1911 2,694,887 Green et al. Nov. 23, 1954 FOREIGN PATENTS 130,532 Australia Dec. 7, 1948 

